924638-04-0Relevant articles and documents
Syntheses, crystal structures, and characterizations of a series of new layered lanthanide carboxylate-phosphonates
Tang, Si-Fu,Song, Jun-Ling,Mao, Jiang-Gao
, p. 2011 - 2019 (2006)
Hydrothermal reactions of different lanthanide(III) salts with (H 2O3PCH2)2NCH2COOH (H 5L1) led to two new layered lanthanide(III) carboxylate-diphosphonates, namely La(H2L1)(H 2O)2·H2O (1) and La(H2L 1)(H2O) (2). The structure of compound 1 features a layered architecture in which the nine-coordinate La3+ ions are bridged by phosphonate groups of the ligands. The carboxylate group of the phosphonate ligand remains protonated and is involved in the interlayer hydrogen bonding. Compound 2 features a double layer structure in which the La 3+ ion is eight-coordinated and the carboxylate group of the ligand is chelated to a La3+ ion in a bidentate fashion. Hydrothermal reactions of lanthanide(III) salts with 4-HOOC-C6H 4-CH2N(CH2PO3H2) 2 (H5L2) afforded three new compounds, namely, La(H4L2)(H3L2)(H2O) ·2H2O (3), Er(H3L2)(H4L 2) (4), and Er(HL3)(H2L3)(H 2O) (5) [H2L3 = H2O 3PCH2N(CHO)(CH2-C6H 4-COOH)]. H2L3 was formed by the in situ oxidation of one P-C bond of the H5L2 ligand. Compound 3 features a (002) lanthanum(III) phosphonate layer in which the seven-coordinate La3+ ions are bridged by diphosphonate moieties of the ligands. The carboxylate group remains protonated and is involved in the interlayer hydrogen bonding. The structure of compound 4 contains a 1D chain along the a axis in which each pair of ErO6 octahedra is bridged by a pair of phosphonate groups. These 1D chains are further interconnected by hydrogen bonds between noncoordinated phosphonate oxygen atoms into a (002) layer with the phenyl carboxylate groups hanging on the interlayer space. The structure of compound 5 is also layered. The interconnection of Er3+ ions by bidentate and tetradentate bridging phosphonate groups resulted in a (002) inorganic layer with the organic groups orientated to the interlayer space. Luminescence properties of compounds 4 and 5 have also been studied. Wiley-VCH Verlag GmbH & Co. KGaA, 2006.
